Joseph a



(No Model.)

J. A. GRANT.

FEED WATER HEATER. No. 312,716. Patented Feb.24,1885.

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- NITE STATES ATENT @FFICEO JOSEPH A. GRANT, OF EVERETT, ASSIGNOR TO THEJARVIS ENGINEERING COMPANY, OF BOSTON, MASSACHUSETTS.

-' a FEED-WATER HEAT-ER.

SPECIFICATION forming part of Letters Patent No. 312,716, dated February24, 1885.

I Application filed May 26, 18$! (Nu modrl.)

To all whom, it may concern.-

Be it known that I, J osnrrr A. GRANT, of Everett, county of Middlesex,State of Massachusetts, have invented an Improvement in 5 Feed-WaterHeaters, of which the following description, in connection with theaccompanying drawings, is a specification, like letters on the drawingsrepresenting like parts.

My invention relates to afeed-water heater 0r apparatus, sometimescalled a fuel-economizer, for utilizing the waste heat from the gasespassing through. the flue of a furnace for heating water or othermaterial which may be used as the feed for the boilers or steamgenrerators that are heated by the said furnace, or

for other purposes.

The feed-water heater consists,esscntially,of continuous seamless pipesbent and supported in the fine, as hereinafter described, the said pipesoccupying the space adjacent to the walls of the flue, and thus leavingthe main passage unobstructed, so that it is readily accessible for thepurposes of cleaning or repairs, and the flow of the gases is notmaterially im- 2 5 peded. The pipes are arranged to afford the maximumexposure to the heated gases, and when two or more pipes are employedeach will have the same, exposure and relation to the flow of gasesabout them and ot' the liquid 0 through them. The feed-water heaterisshown in this instance as composed of two pipes united in common inletand outlet pipes 'at the points where the said piping passes throughfrom the exterior to the interior of the flue, and the reverse. Each ofthe said pipes within the fine is bent into a series of U-shaped loopspassing around three sides of the flue, one leg or portion of the U ofone pipe being nearer to one wall of the flue than the other,

40 and the nearer legs of the two pipes being on opposite sides of thefine, so that the branches of the two pipes have a staggered arrangementalong the adjacent walls of the fine. The liquid moving continuouslythrough one of the 4 5 pipes will first pass through the branch that isnearer to the wall, and then through the branch that is farther from thewall and more exposed to the gases flowing through the flue, and thesaid liquid will thus extract the largest possible amount of heat fromthe said gases. The

pipes are supported and held in the proper position with relation to oneanother by means of holding pieces or bars bolted together from theopposite sides of the said pipes, the said bars with the pipes forming asubstantially rigid frame, which is supported in any suitable way fromthe walls ofthe fines. Figure l is a horizontal section of a portion ofafurnace with a flue and stack containing a I feed-water heaterembodying this invention; 6 Figs. 2 and 3, transverse and longitudinalsections, respectively, of the fine and feedwater heater therein, andFigs. 4 and5 vertical and horizontal sections of a modification to bedescribed.

The feed-water heater is shown as employed in the fluea of a furnace forgenerating steam in aseries of boilers, b. (See Fig. 1.) The saidfeed-water heater consists in this instance of two pipes, c d, which maybe used to convey the feed-water to the boiler, or to supply hot .waterfor any purpose, the said pipes forming two branches from acommonfeed-pipe, f, and preferably uniting in a common delivery pipe,

9, leading to the boiler or other place where 5 the hot'water or othermaterial heated in its passage through the said pipes is to be used. Thesaid pipes c d each consist of a seamless drawn tube,preferably ofcopper orbrass,bent,

as shown in this instance, into a series of U- shaped loops passingtransversely about three sides of the flue, as shown in Fig. 2, thesuccessive-loops being connected together by short bends extendinglongitudinally of the flue, as shown at 2, Figs. 1 and 8. The U-shapedloops (see Fig. 2) of each pipe are somewhat narrower than the interiorof the fine, and are .set nearer one side of the flue than the other,

the pipe (Z, for instance, being nearer the righthand wall and the pipe0 nearer the left-hand go wall when looking in one direction, as seen inFig. 2. The different loops of one pipe are located about midway betweenthose of the other pipe, and consequently the vertical portions of thetwo pipes have a staggered arrangement along the adjacent side of theflue. lVhen the flue is snfiicien'tl y high, the different loops of eachpipe may rise to different heights, as shown in Figs. 2 and 8, thusgiving a staggered arrangement along the upper wall of the flue. Theaverage height of the two pipes will be the same. The pipes d aresupported and held in proper position with relation to one another bybraces 71 h, consisting of rigid bars having sockets arranged to receivea branch of each of the said pipes alternately, the sockets of the barhcorresponding with those of bar h, so that when the two are fastenedtogether, as by the bolts it, they embrace the said pipes, fixing themtightly in place with relation to one another. The socket port-ions ofthe bar h h are offset, as shown, so that they overlap one another andwedge tightly upon the pipes, and the same bars may be used for pipes ofdifferent size, so that one set of patterns will answer for economizersof different capacity. The bars h h may be made in sections of anydesired length, and will be so arranged that the joints of one will becovered by unjointed portions of the other, as

shown in Fig. 3. The braces h it, that engage the horizontal portions orbranches of the pipes which are adjacent to the upper wall of the flue,are shown as attached to lugs or ears m, suspended on cross-bars 0, thatare fixed in the walls of the flue.

In the modification shown in Figs. land 5 the horizontal portions of theU-shaped branches are adjacent to the lower wall or bottom of the flue,instead ofthe top, and the longitudinal portions of the pipes connectingthe different U shapedloops are supported by hooks m, themselvesdepending from plates p, resting on cross-bars 0 in the flue.

The economizer, constructed as herein described, is easily made andaffords but little bstruction to the flue, although the exposure to theheated gas is very great, and by using seamless drawn tubing the dangerof leaky joints is avoided.

The different pipes are of the same length and have substantially thesame position with relation to the fine, so that the liquid circulatesequally and is heated equally in each.

1. The combination of a furnace and flue leading therefrom with afeed-water heater comprising two pipes, each having a series of U-shaped loops passing transversely around the walls of the flue, theside portions of the loops being nearer one side wall ofthe flue thanthe other,and the loops of one pipe being nearer to one wall, and thoseof the other pipe nearer the opposite wall, substantially as and for thepurpose described.

2. In a feed-water heater, the combination. with the pipes bent into aseries of loops, of the bracingbars h h, provided with correspondingrecesses to engage and hold the said pipes between them substantially asdescribed.

3. In a feed-water heater, the combination, with a series of pipes, eachbent into aseries of loops, of the bracing-bars hh, having sockets forembracing the said pipes, the socket portions being offset,substantially as and for the purpose described. I

In testimony whereof I have signed my name to this specification in thepresence oftwo subscribing witnesses.

JOSEPH A. GRANT.

Witnesses:

Jos. P. LWERMORE, W. H. Sresron.

